I do not own one. 6-12 months ago, I was doing a bunch of research on them but couldn't justify the investment as I wasn't sure I'd get enough use out of one. My first thought when I saw this question on HN was, "wow, I haven't thought about 3D printers in 6 months. I'm glad I didn't buy one." I'm sure if I had bought one, I would have used it. But given how little I've thought about it in the past 6 months, I'm glad I didn't. But that is likely mostly because my job doesn't require that type of technology and my personal projects tend to be software oriented.
I know I didn't quite answer the intent of the question, but I thought the $0.02 might still be useful.